One example of a receiver includes a first stage, a second stage, a third stage, and an automatic gain controller. The first stage amplifies an input signal to provide a first signal. The second stage amplifies or attenuates the first signal to provide a second signal based on a tunable gain of the second stage. The tunable gain is adjusted in response to a differential signal. The third stage amplifies the second signal to provide an output signal. The automatic gain controller provides the differential signal based on a comparison between a peak voltage of the output signal and the sum of a common mode voltage of the output signal and an offset voltage.